Anonymous

# Algebra 1 Help!?

I am in the 8th grade and I am taking Algebra 1 for High School Credit. I am having prblems with my math like this one ( its supposed to be X squared).

9x2 - 21x- 18

--------------

-9x2 + 81

I can get the bottom part but not the top part.

Update:

I am in the 8th grade and I am taking Algebra 1 for High School Credit. I am having prblems with my math like this one ( its supposed to be X squared).

9x2 - 21x- 18

--------------

-9x2 + 81

I can get the bottom part wich is

-9(X^2 - 9)

-9 (x - 3)(x + 3)

But i am trying to get the Top Part thats the part i dont get.

Relevance

For the numerator:

Factor out a 3 to make it easier

3 * ( 3x2 - 7x - 6)

3 * ( 3x + 2 ) ( x - 3)

For the denomenator

-9 * (x + 3) (x - 3)

putting it all together

3x + 2

---------

-3(x+3)

• 9x^2 -21x - 18 = 0

(3x -9)(3x+2)=0

3x-9 = 0 3x+2 =0

3x = 9 3x = -2

x=3 x = -2/3

• the bottom comes to -9(x^2 -9) which equals -9(x+3)(x-3).

• Not really sure what your asking... could you be clearer? Are you trying to solve for x that is next to "21"?